Laserfiche WebLink
P=200# <br />ZM <br />Plate use: 4 1/2" x 4 1/2" x 3/8" Stl. Plate. W/ (4)-3/8" x 6" Long Lag Screws. <br />Lag Screws Effective Thread Length for <br />3/8" Dia - 6" Long lag screw: <br />T-E = 3-9/32"(Table L2 - NDS 2018) <br />Moment at guard rail base: <br />M = PxH <br />= 200 x 42 = 8400 lbs-in <br />Withdrawal Load at each Lag screw: <br />Z = (M/D)/N = (8400/2.25)/4 = 933.3# <br />Lag Screws Withdrawal Value : <br />W = 1800xG^(3 <br />2)xD^(3 <br />4)x(T-E)(12.2-1 - NDS 2018) <br />= 1800x0.5^(3 <br />2)x3/8^(3 <br />4)x(3 9 <br />32") = 1000.7# <br />=> Z < W : OK. <br />GUARDRAIL CALCULATION <br />Page 37 of 57 <br />1834 W Third St & <br />#2,33/21/2025